diff -r 000000000000 -r 6474c204b198 browser/themes/windows/devtools/widgets.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/themes/windows/devtools/widgets.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+%include ../../shared/devtools/widgets.inc.css
+
+.breadcrumbs-widget-item:-moz-focusring > .button-box {
+  border-width: 0;
+}
+
+.arrow {
+  -moz-appearance: none;
+  background: url("chrome://global/skin/tree/twisty-clsd.png") center center no-repeat;
+}
+
+.arrow[open] {
+  -moz-appearance: none;
+  background-image: url("chrome://global/skin/tree/twisty-open.png");
+}